Power supply



FIG. 1 is a perspective view of a power supply showing my new design thereof;

FIG. 2 is a right side elevational view thereof;

FIG. 3 is a top plan view thereof;

FIG. 4 is a front side elevational view thereof;

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a rear side elevational view thereof.

The broken lines shown are for illustrative purpose and form no part of the claimed design.

The broken lines shown which define the bounds of the claimed design form no part thereof. 

The ornamental design for a power supply, as shown and described. 